JP4456358B2 - Showcase control device - Google Patents

Description

  The present invention relates to a showcase control device for preventing condensation that occurs on the surface of a refrigerated or refrigerated showcase installed in a convenience store or the like.

  Conventionally, as this type of showcase control device, in order to prevent condensation that occurs in a frozen or refrigerated showcase installed in the store, a dewproof heater is provided on the portion of the showcase subject to dew condensation, The thing which prevented dew condensation by carrying out continuous electricity supply is known. However, the conditions under which dew condensation occurs in the showcase changes depending on the temperature in the showcase and the temperature and humidity in the store. Has the disadvantage of consuming.

  Also, there are known devices that control the dew-proof heater by detecting dew condensation using a dew condensation sensor, and those that control the dew-proof heater according to the set temperature in the showcase. However, a device that controls the dew-proof heater with a dew condensation sensor is prone to failure due to moisture or oil, and therefore has a drawback that dew condensation cannot be detected accurately depending on the installation environment. In addition, since the dew point temperature varies depending on the temperature and humidity, when the dew proof heater is controlled according to the set temperature in the showcase, the dew proof heater cannot be accurately controlled with respect to the actual dew condensation state. There are drawbacks.

  Therefore, the temperature and humidity in the store are detected, the dew point temperature is calculated from the data, and the heater heating temperature is set so that the temperature of the dew-proof heater in the showcase is the same as or higher than the dew point temperature. What was controlled is known (for example, refer patent document 1).

Also, a showcase that does not use a dew condensation sensor is disclosed in Japanese Patent Laid-Open No. 11-304342, and a dew-proof heater control device for a showcase that can save power even after retrofitting and reliably prevent dew condensation is disclosed. It is disclosed in 2003-148856.
JP-A-5-231758 JP-A-11-304342 JP 2003-148856 A

  However, in the conventional example, since the temperature and humidity for calculating the dew point temperature are detected only at predetermined locations in the store, each showcase is set according to the installation location of multiple showcases and the set temperature in each showcase. There may be an error between the actual dew point temperature near the case and the calculated dew point temperature, and the dew proof heater may not be properly controlled. For this reason, there has been a problem that the amount of heating by the dew proof heater is insufficient and condensation cannot be prevented, or the amount of heating of the dew proof heater becomes excessive and power consumption increases more than necessary.

  The present invention has been made in view of the above problems, and its object is to provide a dew-proof heater even when an error occurs between the calculated dew point temperature and the actual dew point temperature near the showcase. An object of the present invention is to provide a control device for a showcase that can always be properly controlled.

In order to achieve the above object, the showcase control device of the present invention includes a dew-proof heater provided at a predetermined location of the showcase, and a surface temperature detecting means for detecting the surface temperature of the showcase near the dew-proof heater, The temperature detection means for detecting the temperature of the showcase installation space and the humidity detection means for detecting the humidity of the showcase installation space are provided, and the dew point temperature is calculated based on the temperature detection means and the detection temperature and the detection humidity of the humidity detection means. The dew point temperature can be corrected based on a preset correction value in a showcase control device that controls the heating temperature of the dew proof heater based on the calculated dew point temperature and the detected temperature of the surface temperature detecting means. comprising a dew point temperature correction means, when the dew point temperature correction means, detecting the rate of temperature rise of the surface temperature detecting means is below a predetermined increase rate by the latent heat of evaporation of the condensed water And the detected temperature, and configured to set the difference between the dew point temperature calculated based on the detected temperature and the detected humidity of the temperature detecting means and the humidity detecting means as the correction value. As a result, the dew point temperature calculated based on a preset correction value is corrected , and detection is performed when the rate of increase in the temperature detected by the surface temperature detecting means is below a predetermined rate due to the latent heat of vaporization of the condensed water. Since the difference between the temperature and the dew point temperature calculated based on the detected temperature and detected humidity of the temperature detecting means and the humidity detecting means is set as the correction value , the calculated dew point temperature and the actual dew point temperature near the showcase Even if an error occurs in between, the dew proof heater is always controlled appropriately.

  In order to achieve the above object, the showcase control device of the present invention has a dew-proof heater provided at a predetermined location of the showcase and a surface temperature detecting means for detecting the surface temperature of the showcase near the dew-proof heater. And a predetermined statistical dew point temperature data including at least standard dew point temperature information for each month is stored in the control device of the showcase that controls the heating temperature of the dew proof heater based on the temperature detected by the surface temperature detecting means. Data storage means, timing means capable of determining at least the month of operation, and dew point temperature obtained from the dew point temperature data of the data storage means corresponding to the time measurement result of the time measurement means and the surface temperature detection means Heater control means for controlling the operation of the dew-proof heater based on the detected surface temperature. Thereby, the operation of the dew-proof heater is always properly controlled based on the dew point temperature acquired from the statistical dew point temperature data and the surface temperature detected by the surface temperature detecting means.

  According to the present invention, even if an error occurs between the calculated dew point temperature and the actual dew point temperature in the vicinity of the showcase, the dew proof heater can always be properly controlled, so that dew condensation is reliably prevented. In addition, it is possible to prevent excessive energization of the dew proof heater and reduce power consumption.

  In addition, according to the present invention, since the dew-proof heater can always be properly controlled based on the statistical dew point temperature data and the surface temperature, it is possible to reliably prevent dew condensation and to prevent the dew-heater from being excessively energized. Thus, power consumption can be reduced.

  1 to 6 show a first embodiment of the present invention. FIG. 1 is a perspective view showing the structure of a store. FIG. 2 is a block diagram showing a control system of a showcase control device. FIG. FIG. 4 is a flowchart showing a control operation for obtaining a correction value of each showcase for correcting the dew point temperature, and FIG. 5 is a diagram showing a surface temperature of the showcase when the dew point temperature is corrected. FIG. 6 is a flowchart showing the alarm operation of the dew-proof heater.

  This showcase control device is provided in a plurality of refrigerated or frozen showcases 20 installed in the store 10, a terminal control unit 30 provided in each showcase 20, and a backyard 11 of the store 10. The centralized control unit 40 is configured to control each showcase 20 in a centralized manner.

  Each showcase 20 has a reach-in showcase in which the opened front and back sides are opened and closed by a glass door, an open showcase in which an air curtain is formed on the opened front, and the opened upper surface is opened and closed by a glass door. There are various types of flat-type refrigerated showcases, etc., and each showcase 20 is provided with an evaporator (not shown) for cooling the inside of the store, and is installed outside the store 10 through a refrigerant pipe. Connected to the machine 21. Each showcase 20 is provided on a surface where condensation occurs on the surface, for example, a glass door frame portion of a reach-in showcase, an open showcase discharge port, a glass door frame of a flat-type refrigerated showcase, or the like. A dew proof heater 22 and a surface temperature detector 23 for detecting the temperature in the vicinity of the dew proof heater 22 are provided.

  The terminal control unit 30 includes a terminal control unit 31 and a terminal communication control unit 32. The terminal control unit 31 includes a microcomputer and is connected to the dew proof heater 22, the surface temperature detection unit 23, and the terminal communication control unit 32. The terminal communication control unit 32 is connected between the terminal control unit 31 and the centralized control unit 40 via a communication line.

  The centralized control unit 40 includes a centralized control unit 41 that is an arithmetic device, a storage unit 42 that stores each showcase 20 and data, a display unit 43, and an operation unit 44 that sets and operates each showcase 20, A centralized communication control unit 45 for transmitting / receiving various data to / from each terminal control unit 30 is provided. The central control unit 41 is formed of a microcomputer, and includes a storage unit 42, a display unit 43, an operation unit 44, a central communication control unit 45, an in-store temperature detection unit 46 and an in-store humidity detection provided in the air inlet of the air conditioner. Connected to the unit 47. The storage unit 42 is configured to store data transmitted to each terminal control unit 30 and data detected from each detection unit. The display unit 43 displays information such as operation status and setting confirmation of each showcase 20, in-store temperature, in-store humidity, and the like. The operation unit 44 switches information displayed on the display unit 43 and sets operating conditions for each showcase 20. The centralized communication control unit 45 is connected between the centralized control unit 41 and the terminal control unit 30 via a communication line, and is connected to a management center 50 that manages the showcase 20 from the outside of the store 10 such as a telephone line. Connected via communication line.

  The storage unit 42 stores in advance a dew point temperature table 42a that is assumed from weather data such as the area, season, time, etc. of the store 10, and further, the store temperature detector 46 and store humidity in the store 10 are stored. By taking the dew point temperature calculated by the detection unit 47 into the dew point temperature table 42a, the data of the dew point temperature table 42a is rewritten.

  Here, the control operation of the dew proof heater 22 will be described with reference to FIG. First, if the surface temperature T of the showcase 20 is detected by the surface temperature detector 23 (S1) and the temperature in the store 10 can be detected (S2), the temperature in the store 10 is detected by the store temperature detector 46. It is detected (S3). If the humidity in the store 10 can be detected (S4), the store humidity detection unit 47 detects the humidity in the store 10 (S5), and the dew point temperature T1 is calculated from the temperature and humidity in the store 10 (S6). The dew point temperature table is rewritten based on the calculated dew point temperature T1 (S7). Next, by adding a preset correction value α to the dew point temperature T1, a corrected dew point temperature T1 'is calculated (S8), and the surface temperature T of each showcase 20 and the corrected dew point temperature T1' are compared. Here, the correction value α is set based on the location of the showcase in the store, the type of showcase, the measured value of the dew point temperature near the showcase, and the like. When the surface temperature T is equal to or higher than the corrected dew point temperature T1 'and the predetermined value β is added to the corrected dew point temperature T1' or lower than the corrected dew point temperature T1 '+ β (S9), the energization rate of the dew prevention heater 22 is changed. Absent. When the surface temperature T is lower than the corrected dew point temperature T1 '(S10), the energization rate of the dew proof heater 22 is increased (S11). If the surface temperature T is higher than the corrected dew point temperature T1 '+ β (S10), the energization rate of the dew proof heater 22 is decreased (S12). Further, when the temperature or humidity in the store 10 cannot be detected due to a failure of the store temperature detecting unit 46 and the store humidity detecting unit 47 (S2, S4), the dew point temperature T2 is determined from the dew point temperature table 42a of the storage unit 42. (S13), and by adding a correction value α obtained by correcting the dew point temperature of each showcase 20 to the dew point temperature T2, a corrected dew point temperature T2 'is calculated (S14). When the corrected dew point temperature T2 'is compared with each surface temperature T and the surface temperature T is equal to or higher than the corrected dew point temperature T2' and equal to or lower than the corrected dew point temperature T2 '+ β (S15), the energization rate of the dew prevention heater 22 is changed. Not performed. When the surface temperature T is lower than the corrected dew point temperature T2 '(S16), the energization rate of the dew proof heater 22 is increased (S17). If the surface temperature T is higher than the corrected dew point temperature T2 '+ β (S16), the energization rate of the dew proof heater 22 is decreased (S18).

  The correction value α has been set to an arbitrary value in advance. A control operation for obtaining the correction value α of each showcase 20 by automatic correction will be described with reference to FIG. First, when a predetermined number of days elapses from the previous dew point temperature correction (S21), or when an operation for correction is performed by the operation unit 44 (S22), the power of the dew proof heater 22 is turned off (S23). After a predetermined time has elapsed (S24), the dew proof heater 22 is energized (S25), and the surface temperature T of each showcase 20 is measured every time t (S26). The temperature ΔT rising at every measurement time t is detected (S27), ΔT becomes smaller than ΔT3 (S28), and when this state is detected for a predetermined time (S29), the surface temperature T4 at that time is detected. (S30). The temperature in the store 10 at that time is detected (S31), the humidity in the store 10 is detected (S32), the dew point temperature T5 is calculated (S33), and the difference between the dew point temperature T5 and the surface temperature T4 is calculated. A certain correction value α is stored (S34).

  Here, as shown in FIG. 5, the surface temperature T of each showcase 20 where dew condensation has occurred is a temperature T4 at which the rate of temperature increase is reduced by the latent heat of vaporization of the dew condensation water, which is the actual dew point temperature of each showcase. The dew point temperature is corrected based on the temperature T4.

  In addition, an operation for displaying an alarm for the energization rate of each dew proof heater 22 that is higher than a predetermined value will be described with reference to FIG. First, the energization rate of the dew-proof heater 22 is detected (S41). If the energization rate is equal to or higher than the upper limit (S42), it is recorded in the storage unit 42 as an alarm history (S43), and an alarm is displayed on the display unit 43. (S44).

  As described above, according to the present embodiment, the dew point temperature is corrected based on the preset correction value, so the dew point temperature calculated from the temperature and humidity in the store 10 and the actual vicinity of the showcase 20 Even if an error occurs between the dew point temperature and the dew point heater 22, the dew proof heater 22 can always be properly controlled to reliably prevent dew condensation and prevent the dew proof heater 22 from being excessively energized. Power consumption can be reduced.

  Further, the dew point heater 22 is controlled based on the dew point temperature calculated from the temperature and humidity in the store 10, the dew point heater 22 is stopped and each showcase 20 is condensed, and then the temperature of the dew point heater 22 is set. Since the dew point temperature is corrected based on the detected temperature when the rate of increase of the detected temperature of the surface temperature detection unit 23 when the temperature increases is equal to or less than the predetermined rate of increase, the temperature and humidity in the store 10 Even when an error occurs between the dew point temperature calculated from the above and the actual dew point temperature in the vicinity of the showcase 20, the dew proof heater 22 can always be properly controlled and condensation can be reliably prevented. At the same time, excessive energization of the dew proof heater 22 can be prevented to reduce power consumption.

  In addition, since the dew point temperature of each showcase 20 can be corrected at a predetermined time or at an arbitrary time, the dew point temperature can be periodically corrected and the dew point temperature can be manually corrected arbitrarily. In addition, it is possible to cope with changes in the environment in the store, and it is possible to make corrections when newly installing the showcase 20 or moving within the store.

  Further, a dew point temperature table 42a that stores predetermined dew point temperature data in advance is provided, and a dew prevention heater is used based on the dew point temperature data of the dew point temperature table 42a without using the detected values of the in-store temperature detecting unit 46 and the in-store humidity detecting unit 47. 22 is controlled, the dew point heater 22 can be controlled based on the dew point temperature data of the dew point temperature table 42a, the failure of the in-store temperature detection unit 46 or the in-store humidity detection unit 47 in the store 10, etc. Even if the temperature and humidity in the store 10 cannot be detected, the dew proof heater 22 can be controlled.

  Further, since the dew point temperature data of the dew point temperature table 42a is set based on the weather data corresponding to the installation location of the showcase 20, the dew point temperature data corresponding to the location, season, time, etc. of the store where the showcase is installed is used. The dew proof heater 22 can be controlled based on this, and the dew proof heater 22 can be appropriately controlled using the dew point temperature table 42a.

  In addition, since the dew point temperature data of the dew point temperature table 42a is rewritten based on the dew point temperature calculated from the detection results detected by the in-store temperature detecting unit 46 and the in-store humidity detecting unit 47, the dew point temperature table 42a is changed to each store. The data according to each of the ten environments can be rewritten, and the accuracy of control of the dew proof heater 22 using the dew point temperature table 42a can be further improved.

  Further, since an alarm is issued when the energization rate of the dew proof heater 22 exceeds a predetermined upper limit value, an abnormality of each showcase 20 such as a failure can be dealt with immediately. Further, when the energization rate equal to or higher than the upper limit value of each dew prevention heater 22 is detected, the detection result can be stored in the storage unit 42 as an alarm history, and the alarm history can be displayed on the display unit 43. The alarm history of the dew-proof heater 22 can be analyzed to correct the malfunction of the control operation.

  In addition, since the heater driving information such as the heating temperature of the dew-proof heater 22 and the energization rate is transmitted to the management center 50, information in the store 10 is obtained by the management center 50 and each showcase 20 is set. The showcases 20 of the plurality of stores 10 can be managed collectively.

  Next, a second embodiment of the present invention will be described.

  In the second embodiment, a statistical dew point temperature table 42a obtained from past weather data is used as the dew point temperature table in the first embodiment described above. Furthermore, in the second embodiment, the correction value of the dew point temperature can be set by manual switching of the operator, and the operation control of the dew proof heater can be performed by selecting any one of the three types. did. Other configurations in the second embodiment are the same as those in the first embodiment.

  That is, as the dew point temperature table 42a in the second embodiment, the standard dew point obtained by calculating the average dew point temperature for each month, day and time based on the weather data for the past several years in the area where the store exists. Temperature data is used. Further, the central control unit 41 has a clock and calendar function so that the terminal control unit 30 and the central control unit 40 can recognize the month, day and time during operation.

  In the second embodiment, the correction value γ can be manually input when the operation control of the dew prevention heater 22 is performed based on the dew point temperature table 42 a using the operation unit 44 and the display unit 43 of the central control unit 40. In addition, the operation mode of the dew proof heater 22 can be set to any one of three types of “continuous operation”, “automatic two operation”, and “automatic one operation” for each showcase. This “continuous operation” mode is a mode in which the output of the dew proof heater 22 is continuously operated (continuously energized) with 50% of the maximum output, and the “automatic two operation” mode is a dew point temperature calculated to enhance prevention of condensation. In this mode, the correction value 2K is further added to control the operation of the dew proof heater 22. The “automatic 1 operation” mode is a normal mode.

  Next, the control operation of the dew proof heater 22 in the second embodiment will be described with reference to FIGS. When starting the control operation of the dew-proof heater 22, the operator uses the operation unit 44 and the display unit 43 of the central control unit 40 to set the operation mode and the correction value γ (correction temperature value) for each showcase. Set the input. At this time, as shown in FIG. 7, the title 51 of “dew condensation heater energization setting” is displayed on the screen of the display unit 43. On the dew-proof heater energization setting screen, presence / absence information 52 of sensors in the in-store temperature detection unit 46 and sensors in the in-store humidity detection unit 47 (hereinafter collectively referred to as in-store temperature / humidity sensors), correspondence display of set values and symbols 53, the system name and refrigerator unit number information 54, the case unit number and its setting status information 55 in the system, the manually input correction value γ value 56, and screen switch function information 57 and 58 are displayed. The

  The presence / absence information 52 of the in-store temperature / humidity sensor indicates “Yes” when the in-store temperature / humidity sensor is connected and is operating effectively, and indicates whether the in-store temperature / humidity sensor is not connected or the operating state. If it is abnormal, “None” is displayed.

  The set value and symbol correspondence display 53 displays the operation mode name corresponding to the symbol such as “「: Auto 1 ○: Auto 2 ●: Continuous ”.

  In the system name and refrigerator unit number information 54, for example, “<< Refrigeration 1” is displayed as the system name, and a number such as “201” is displayed as the refrigerator unit number.

  In the showcase cordless handset number and its setting state information 55 in the system, an operation mode symbol is displayed corresponding to the showcase cordless handset number.

  The manually input correction value γ 56 is displayed with a positive / negative sign indicating the temperature correction value γ manually input by the operator.

  For example, characters such as “normal setting selection” and “system switching” are displayed in the function information 57 and 58 of the screen changeover switch. By operating these switches, setting selection switching and system switching can be performed. it can.

  These input settings can be made at any time as long as the control operation of the dew proof heater 22 is being performed. Moreover, said information displayed on a screen can be switched and displayed for every system | strain and freezer.

  When the control operation of the dew-proof heater 22 is started, first, the surface temperature T of the showcase 20 is detected by the surface temperature detector 23 (S51), and the operation mode and the correction value γ are acquired by the central controller 41. (S52, S53).

  Next, if the temperature in the store 10 can be detected (S54), the temperature in the store 10 is detected by the store temperature detecting unit 46 (S55). If the humidity in the store 10 can be detected (S56), the store humidity detection unit 47 detects the humidity in the store 10 (S57), and the dew point temperature T1 is calculated from the temperature and humidity in the store 10 (S58). ). Next, the value of the dew point temperature T1 is set as the value of the corrected dew point temperature T6 (S59).

  On the other hand, if the temperature or humidity in the store 10 cannot be detected or the sensor is not connected (S54, S56) due to a failure of the store temperature detection unit 46 and the store humidity detection unit 47, the month of operation The dew point temperature T2 corresponding to the date and time is called from the dew point temperature table 42a of the storage unit 42 (S60), and the value of the dew point temperature T2 is set as the value of the corrected dew point temperature T6 (S61).

  Next, the set operation mode is determined (S62, S63), and when the operation mode is set to “continuous” operation, the output of the dew proof heater 22 is set to 50% of the maximum output, and the continuous operation is performed. (S64). This “continuous operation” mode is used for a predetermined time, that is, until the dew is removed when a large amount of dew is generated and the dew cannot be easily removed by the “auto 1” or “auto 2” operation. The initial operation mode when the control device is activated is the “auto 1” operation mode. Further, here, in the “continuous” operation mode, the output of the dew proof heater 22 is continuously operated at 50% of the maximum output. However, the present invention is not limited to this, and the type and size of the showcase are considered. Thus, it is preferable to appropriately set the output of the dew proof heater 22 in the “continuous” operation mode.

  When the operation mode is set to “automatic 2” operation, a value obtained by adding the manually input correction value γ to the correction dew point temperature T6 is set as a new correction dew point temperature T6 (S65). ) And the same control as when the operation mode is set to “auto 1” operation. As the correction value γ, either a positive numerical value or 0 or a negative numerical value is input and set by the operator. Therefore, when a negative numerical value is input and set, the correction value γ is calculated from the corrected dew point temperature T6. A value obtained by subtracting the absolute value is set as a new corrected dew point temperature T6. This “Auto 2” operation mode is more than necessary when the operation is performed in the “Auto 1” operation mode, and sufficient correction effect is not obtained and the dew is insufficient or when the operation is performed in the “Auto 1” operation mode. This is used when the power is consumed.

  When the operation mode is set to "automatic 1" operation, the surface temperature T is equal to or higher than the corrected dew point temperature T6, and is equal to or lower than the corrected dew point temperature T6 + β obtained by adding the predetermined value β to the corrected dew point temperature T6. In this case (S66), the process proceeds to S51 described above without changing the energization rate of the dew proof heater 22. When the surface temperature T is lower than the corrected dew point temperature T6 (S67), the energization rate of the dew prevention heater 22 is increased (S68), and then the process proceeds to S51. If the surface temperature T is higher than the corrected dew point temperature T6 + β (S69), the energization rate of the dew proof heater 22 is decreased (S70), and then the process proceeds to S51.

  According to the control device of the second embodiment described above, it is possible to appropriately control the dew proof heater 22 regardless of the presence or absence of the temperature sensor and the humidity sensor. Furthermore, since the dew point temperature calculation method is automatically switched depending on the presence or absence of the temperature and humidity sensors (normal operation, non-operation or abnormal operation), inappropriate dew-proof heater control due to forgetting to set can be prevented.

  In addition, since a plurality of operation modes can be set as described above, it is easy to select an appropriate operation mode, thereby achieving both dew performance and energy saving. Furthermore, since the operation mode for each showcase can be individually set, the dew proof heater 22 can be operated under the optimum conditions for each showcase, and thus an effect excellent in energy saving is exhibited.

  In addition, since the operation is possible without attaching the temperature sensor and humidity sensor of the in-store temperature detecting unit 46 and the in-store humidity detecting unit 47, it is possible to construct a system with reduced cost without using expensive sensors. Is possible.

  Further, the correction value γ can be input by manual setting of the operator, and the correction method of the dew point temperature has been simplified, so that the correction value γ can be selected flexibly according to the judgment of the operator.

  In addition, since multiple operation modes are provided, the operation mode can be changed by manual setting by the operator, and corrections that directly affect the dew-proof heater drive can be performed. It is possible to minimize problems such as inability to remove.

  In the second embodiment, the central control unit 41 is provided with means for measuring the date and time, and the storage unit 42 includes statistical data corresponding to the date and time in the area of the store where the showcase is installed. Dew point temperature data 42a including standard dew point temperature information is stored, but the central control unit 41 is provided with a time measuring means for measuring only the month, and dew point temperature data including statistical standard dew point temperature information corresponding to each month. 42a may be stored to perform control more simplified than the above configuration. Even in such a configuration, when the dew removal is incomplete, the correction value γ can be set flexibly according to the correction value γ manually set by the operator, and optimal dew-proof heater control can be performed.

  In the second embodiment, the correction value γ can be manually set for each system, but the correction value γ may be manually set for each slave in the system. Further, the in-store temperature detection unit 46 and the in-store humidity detection unit 47 may be deleted, and a control device without these temperature sensor and humidity sensor may be configured. In this case, since it is possible to perform appropriate control based on the dew point temperature data 42a without using expensive sensors, it is possible to construct a control device with reduced costs. Further, for example, the in-store temperature detection unit 46 and the in-store humidity detection unit 47 may be separated from the central control unit 41 by a manual switch, a connection connector, or the like.

  It goes without saying that the present invention is not limited to the configurations of the first and second embodiments.

The perspective view which shows the structure of the shop which shows 1st Embodiment of this invention. Block diagram showing the control system of the control device of the showcase The flowchart which shows the control operation of the dewproof heater of 1st Embodiment. Flow chart showing control operation for correcting dew point temperature of each showcase The figure which shows the surface temperature change of the showcase when dew point temperature is corrected Flow chart showing alarm operation of dew-proof heater The figure which shows the dew-proof heater energization setting screen in 2nd Embodiment The flowchart which shows the control operation of the dewproof heater of 2nd Embodiment. The flowchart which shows the control operation of the dewproof heater of 2nd Embodiment. The flowchart which shows the control operation of the dewproof heater of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Store, 20 ... Showcase, 22 ... Dew prevention heater, 23 Surface temperature detection part, 30 ... Terminal control unit, 40 ... Central control unit, 41 ... Central control part, 42 ... Memory | storage part, 42a ... Dew point temperature table, DESCRIPTION OF SYMBOLS 43 ... Display part, 44 ... Operation part, 45 ... Central communication control part, 46 ... Store temperature detection part, 47 ... Store humidity detection part, 50 ... Management center.

Claims (16)

A dew-proof heater provided at a predetermined location of the showcase, a surface temperature detecting means for detecting the surface temperature of the showcase near the dew-proof heater, a temperature detecting means for detecting the temperature of the showcase installation space, and a showcase installation A humidity detecting means for detecting the humidity of the space, calculating the dew point temperature based on the detected temperature and the detected humidity of the temperature detecting means and the humidity detecting means, and based on the calculated dew point temperature and the detected temperature of the surface temperature detecting means In the control device of the showcase that controls the heating temperature of the dew proof heater,
A dew point temperature correcting means capable of correcting the dew point temperature based on a preset correction value ;
The dew point temperature correction means includes a detection temperature when the rate of increase of the detection temperature of the surface temperature detection unit is below a predetermined rate of increase due to the latent heat of evaporation of the condensed water, and the detection temperature and detection humidity of the temperature detection unit and humidity detection unit. A control device for a showcase, wherein the difference from the dew point temperature calculated based on is set as the correction value . After the dew-proof heater is stopped or its heating temperature is lowered below a predetermined temperature, the dew-proof heater is operated above the predetermined heating temperature after a predetermined time has elapsed until the surface of the showcase is condensed. The apparatus for controlling a showcase according to claim 1 , further comprising a heater control unit configured to perform heating. The showcase control device according to claim 1 or 2, wherein the dew point temperature correcting means is configured to correct the dew point temperature at a predetermined time or an arbitrary time. Data storage means for storing predetermined dew point temperature data in advance;
A heater control means capable of controlling the dew-proof heater based on the dew point temperature data of the data storage means without using the detection values of the temperature detection means and the humidity detection means. The showcase control device described. The showcase control device according to claim 4, wherein the dew point temperature data of the data storage means is set based on weather data corresponding to a place where the showcase is installed. 6. The show according to claim 4, further comprising data rewriting means for rewriting the dew point temperature data of the data storage means based on the dew point temperature calculated from the detected temperature and the detected humidity of the temperature detecting means and the humidity detecting means. Case control device. 7. The showcase according to claim 1, further comprising alarm means for issuing a predetermined alarm when a heating temperature or an energization rate of the dew-proof heater exceeds a predetermined upper limit value. Control device. 8. The showcase according to claim 1, further comprising communication means capable of transmitting heater drive information such as a heating temperature and an energization rate of the dew-proof heater to the outside. Control device. A dew proof heater provided at a predetermined location of the showcase and a surface temperature detecting means for detecting the surface temperature of the showcase near the dew proof heater, and heating the dew proof heater based on the detected temperature of the surface temperature detecting means In the control device of the showcase that controls the temperature,
Data storage means for storing predetermined statistical dew point temperature data including at least monthly standard dew point temperature information;
A timing means capable of determining at least the month of operation;
Heater control means for controlling the operation of the dew-proof heater based on the dew point temperature acquired from the dew point temperature data of the data storage means and the surface temperature detected by the surface temperature detection means corresponding to the time measurement result of the time measuring means. A control device for a showcase, comprising: The time measuring means comprises means for measuring the date and time,
The data storage means stores dew point temperature data including statistical standard dew point temperature information corresponding to the date and time in the area of the store where the showcase is installed,
The said heater control means has a means to control operation | movement of the said dew-proof heater based on the dew point temperature acquired from the said dew point temperature data corresponding to the timing result of the said time measuring means. Item 15. The showcase control device according to Item 9. Temperature detection means for detecting the temperature of the showcase installation space;
Humidity detection means for detecting the humidity of the showcase installation space;
Second heater control means for controlling the operation of the dew-proof heater based on the detection results of the temperature detection means and the humidity detection means and the surface temperature detected by the surface temperature detection means;
Sensor operation determination means for determining whether or not the temperature detection means and the humidity detection means are operating normally;
As a result of the determination by the sensor operation determining means, when the temperature detecting means and the humidity detecting means are operating normally, the operation of the dew-proof heater is controlled by the second heater control means, and the temperature detection The heater control selection means which controls operation | movement of the dew-proof heater by the heater control means when at least one of the means and the humidity detection means is abnormal is provided. Showcase control device. Correction value acquisition means for acquiring a positive numerical value or 0 or a negative numerical value input by an operator as a correction value;
The showcase control device according to any one of claims 9 to 11, further comprising dew point temperature correction means for correcting the dew point temperature based on the correction value. Comprising an operation mode acquisition means for acquiring the operation mode set by the operator;
The heater control unit and the second heater control unit set the dew point temperature used for controlling the dew proof heater to be higher by a predetermined temperature based on a predetermined correction value than the dew point temperature acquired from the dew point temperature data. A plurality of operation modes including a second operation mode for controlling the operation of the dew heater and a continuous operation mode for continuously operating the dew proof heater, based on the operation mode acquired by the operation mode acquisition means; The showcase control device according to any one of claims 9 to 11, further comprising operation mode switching means for switching the operation mode. The showcase control device according to claim 13, wherein in the continuous operation mode, the dew-proof heater is operated at 50% of the maximum output of the dew-proof heater. The showcase control device according to claim 13, further comprising correction value acquisition means for acquiring a positive numerical value or 0 or a negative numerical value input by an operator as the correction value. The showcase control device according to claim 13, wherein the operation mode switching means includes means for individually switching the operation mode for each of the two or more showcases.

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